Director Matthew Tappin sells small stakes; 185-share vesting at STEM (NYSE: STEM)

Rhea-AI Filing Summary

Matthew Tappin reported multiple small open-market dispositions of common shares and a grant/vesting of restricted common stock. The filing lists sales of 522, 366 and 300 shares on 02/19/2026, 02/20/2026 and 03/03/2026 respectively, and a restricted stock vesting of 185 shares on 03/01/2026 labeled as compensation.

Insights

Corporate Governance Analyst

Small-scale insider disposals and a routine vesting event were reported.

The filing documents three small dispositions totaling 1,188 shares across 02/19/2026–03/03/2026, with individual sale proceeds recorded in the filing. It also lists a restricted stock vesting of 185 shares on 03/01/2026 as compensation.

These volumes are modest relative to typical company floats; the actions appear routine and tied to compensation vesting and subsequent sales rather than a singular material event.

Form 144 Filer Information	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 144 NOTICE OF PROPOSED SALE OF SECURITIES PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933
FORM 144

144: Filer Information

Filer CIK
Filer CCC
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer

SEC File Number

Address of Issuer

Phone

Name of Person for Whose Account the Securities are To Be Sold

See the definition of "person" in paragraph (a) of Rule 144. Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice.

Relationship to Issuer

144: Securities Information

Title of the Class of Securities To Be Sold	Name and Address of the Broker	Number of Shares or Other Units To Be Sold	Aggregate Market Value	Number of Shares or Other Units Outstanding	Approximate Date of Sale	Name the Securities Exchange
Common	Fidelity Brokerage Services LLC 900 Salem Street Smithfield RI 02917	185	1850.00	8390208	03/04/2026	NYSE

Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

144: Securities To Be Sold

Title of the Class	Date you Acquired	Nature of Acquisition Transaction	Name of Person from Whom Acquired	Is this a Gift?	Date Donor Acquired	Amount of Securities Acquired	Date of Payment	Nature of Payment *
Common	03/01/2026	Restricted Stock Vesting	Issuer			185	03/01/2026	Compensation

* If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.

Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

144: Securities Sold During The Past 3 Months

Name and Address of Seller	Title of Securities Sold	Date of Sale	Amount of Securities Sold	Gross Proceeds
Matthew Tappin 1400 Post Oak Boulevard. Suite 560 Houston TX 77056	Common	02/19/2026	522	5847.50
Matthew Tappin 1400 Post Oak Boulevard. Suite 560 Houston TX 77056	Common	02/20/2026	366	4172.40
Matthew Tappin 1400 Post Oak Boulevard. Suite 560 Houston TX 77056	Common	03/03/2026	300	2901.48

144: Remarks and Signature

Remarks

Date of Notice

Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1

ATTENTION:

The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. If such person has adopted a written trading plan or given trading instructions to satisfy Rule 10b5-1 under the Exchange Act, by signing the form and indicating the date that the plan was adopted or the instruction given, that person makes such representation as of the plan adoption or instruction date.

Signature

ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)

FAQ

What did Matthew Tappin report in the Form 144 for STEM?

He reported three dispositions of common shares: 522, 366, and 300 shares on 02/19/2026, 02/20/2026, and 03/03/2026, plus a restricted stock vesting of 185 shares on 03/01/2026, listed as compensation.

How much cash did the reported sales generate in the Form 144?

The filing lists proceeds for each sale: $5,847.50, $4,172.40, and $2,901.48, tied to the 522, 366, and 300 share dispositions respectively, as recorded in the excerpted sale rows.

Were any shares granted or vested according to the filing?

Yes, the filing shows a restricted stock vesting of 185 common shares on 03/01/2026 and labels the transaction type as Compensation, indicating these shares arose from an equity compensation vesting event.

Does the Form 144 show large insider selling that could indicate a material event?

No; the excerpted transactions are small-scale dispositions totaling 1,188 shares alongside a 185-share vesting. The filing presents routine compensation vesting and subsequent sales rather than a single large-scale, material disposition.